html{
    background: url(../img/集原美.jpg);
    background-color: #262626;
}
h1{
    text-align: center;
    background-color: hotpink;
}
.login-wrap{
    width: 300px;
    height: 200px;
    background: linear-gradient(red,hotpink,rgb(176, 44, 156));
    text-align: center;
    position: absolute;
    top: 0;bottom: 0;right: 0;left: 0;
    margin: auto;
    line-height: 50px;
}
#hidden{
    color: blue;
    font-weight: 600;
    display: none;
}